DOI: 10.1175/JCLI-D-15-0071.1
Scopus记录号: 2-s2.0-84959469694
论文题名: Resolving contrasting regional rainfall responses to EL Niño over tropical Africa
作者: Parhi P. ; Giannini A. ; Gentine P. ; Lall U.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 4 起始页码: 1461
结束页码: 1476
语种: 英语
Scopus关键词: Atmospheric pressure
; Atmospheric temperature
; Nickel
; Oceanography
; Surface waters
; Tropics
; Water vapor
; Atmospheric columns
; Eastern tropical pacific
; Sea surface temperature (SST)
; Seasonal mean rainfall
; Seasonal rainfall
; Southern oscillation
; Tropospheric warming
; Vertical stability
; Rain
; air-sea interaction
; El Nino
; El Nino-Southern Oscillation
; precipitation intensity
; rainfall
; regional climate
; sea surface temperature
; water vapor
; Atlantic Ocean
; Atlantic Ocean (North)
; Indian Ocean
; Sahel [Sub-Saharan Africa]
英文摘要: The evolution of El Niño can be separated into two phases-namely, growth and mature-depending on whether the regional sea surface temperature has adjusted to the tropospheric warming in the remote tropics (tropical regions away from the central and eastern tropical Pacific Ocean). The western Sahel's main rainy season (July-September) is shown to be affected by the growth phase of El Niño through (i) a lack of neighboring NorthAtlantic sea surfacewarming, (ii) an absence of an atmospheric column water vapor anomaly over the North Atlantic and western Sahel, and (iii) higher atmospheric vertical stability over the western Sahel, resulting in the suppression of mean seasonal rainfall as well as number of wet days. In contrast, the short rainy season (October-December) of tropical eastern Africa is impacted by the mature phase of El Niño through (i) neighboring Indian Ocean sea surface warming, (ii) positive column water vapor anomalies over the Indian Ocean and tropical eastern Africa, and (iii) higher atmospheric vertical instability over tropical eastern Africa, leading to an increase in the mean seasonal rainfall aswell as in the number ofwet days.While themodulation of the frequency of wet days and seasonalmean accumulation is statistically significant, daily rainfall intensity (for days with rainfall > 1 mm day-1), whether mean, median, or extreme, does not show a significant response in either region. Hence, the variability in seasonal mean rainfall that can be attributed to the El Niño-Southern Oscillation phenomenon in both regions is likely due to changes in the frequency of rainfall. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50089
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth and Environmental Engineering, Columbia University, New York, United States; International Research Institute for Climate and Society, Earth Institute, Columbia University, New York, United States; Department of Earth and Environmental Engineering, and Columbia Water Center, Earth Institute, Columbia University, New York, United States; Department of Earth and Environmental Engineering, International Research Institute for Climate and Society, and Columbia Water Center, Earth Institute, Columbia University, New York, United States
Recommended Citation:
Parhi P.,Giannini A.,Gentine P.,et al. Resolving contrasting regional rainfall responses to EL Niño over tropical Africa[J]. Journal of Climate,2016-01-01,29(4)